JP2000064270A - Water passing method in column row type underground continuous wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water passing method which is extremely excellent in site efficiency by reducing the projection of a drain to an outer side of a cut-off wall as much as possible in a soil cement column row type underground continuous wall. SOLUTION: Soil cement columns 12 with a wide flange beam 11 are continuously installed underground to construct a cut-off wall 10. A drain 15 is arranged so as not to be excessively projected to a ground 13 on the outer side from the cut-off wall 10. An impervious steel plate 17 is installed in a closely fitting manner to the surface of an inner flange 16 of two the wide flange beams 11 to form a side wall on the side opposite to the ground of the drain 15. In the drain 15, a catchment side or a recharge side is opposite to a ground 13, and an underground water is shielded by the impervious steel plate 17 for the inner side. Since most of the drains 15 are arranged within the wall thickness of the cut-off wall 10, and installed to the depth of an underground water- passing layer 19, the projection of the drain 15 to the outer ground 13 can be reduced, and the site efficiency is extremely excellent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water passage construction method for a column-type underground continuous wall, and is particularly suitable for a mountain retaining construction method for securing water stoppage when constructing an underground structure and ensuring water passage when completed. This is related to the water flow method in a column-type underground continuous wall.

[0002]

2. Description of the Related Art A conventional mountain retaining method, that is,
The continuous underground wall construction method and soil cement column wall construction method are constructed by constructing a continuous underground wall with waterproofing as a mountain retaining material, and excavating the inner ground surrounded by the underground continuous wall to construct an underground structure. After building things, backfilling of earth and sand is performed. In this case, during construction of the underground structure, the underground continuous wall blocks the flow of groundwater, and the construction can be performed with the water stopping function secured.However, even after the completion of the construction, the underground continuous wall left in the ground allows the passage of water. The water remained blocked, the groundwater system changed, and it became a major problem in the regional underground environment.

Therefore, the Applicants have arranged a special water-passing frame such as a circular, rectangular or polygonal tubular frame or a groove-shaped frame in the vertical direction in the underground continuous wall to provide the underground The continuous wall has both the function of blocking water and the function of passing water, and the special water frames of the underground continuous walls on both sides of the ground excavation part for underground construction are connected to each other with coarse particles or pipes. A method for passing water through a continuous underground wall, which allows free passage of blocked groundwater, has been realized (JP-A-6-49839 and JP-A-1).
0-168872).

[0004]

However, in the soil cement column wall construction method, solidifying material such as cement milk is mixed during excavation of a drilling hole in the ground to solidify soil cement in which excavated soil and cement milk are mixed. H before
A stress bearing material for earth pressure such as shaped steel is installed, and such soil cement columns are sequentially formed and solidified as they are to construct a water blocking wall in the ground. Therefore, it is difficult to dispose the special water passage frame in the water stop wall, and even after the completion of the work inside the water stop wall, groundwater remains blocked across this work section. There was a problem of becoming. In addition, the soil cement column wall construction method is usually of a triple type capable of simultaneously excavating three continuous excavation holes, and the construction accuracy is maintained while aligning the excavation holes at the ends by overlapping. ing. Therefore, we have
A construction method was proposed in which water collecting or condensing means, for example, a well such as a crushed stone drain, was placed on the ground side, that is, the outside, of the underground continuous wall constructed in this way. However, in this case, the well protruded into the outer ground, causing a problem of poor site efficiency.

An object of the present invention is to minimize the amount of water collecting or condensing means such as a crushed stone drain protruding to the ground outside the water blocking wall in a soil cement column type underground continuous wall, thereby reducing the site efficiency. It is to provide an extremely good water flow method.

[0006]

The water-flowing method for a column-lined underground continuous wall of the present invention has solved the above-mentioned problems as follows. In the present invention, a soil cement column having a stress bearing material such as H-shaped steel is continuously arranged in a vertical drilling hole to form a water blocking wall, and is wrapped around the water blocking wall and the outer ground. In the water passage method in a column-type underground continuous wall where water collecting or condensing means such as crushed stone drain is arranged, the arrangement part of the water collecting or condensing means is located on the inner side between adjacent stress bearing members. It is characterized in that a water blocking plate is installed, and the water collecting or condensing means is arranged on the outside in contact with the water blocking plate. According to the present invention, it is possible to make the water collecting surface or the water collecting surface of the water collecting or condensing means such as the drain face the outer side ground, and to block the ground water from the inside by the water blocking plate. Further, since such water collecting or condensing means can be installed within the wall thickness of the water blocking wall, it is possible to reduce the protruding portion to the outer ground, and the site efficiency is extremely good.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views for explaining an embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a vertical sectional view. As shown in these figures, the column-column type underground continuous wall (water blocking wall) 10 is a circular soil cement column 12 with a stress bearing material (H-shaped steel) 11 installed, for example, a circular cement cement column 12 with a diameter of about 850 mm. It is built and installed in succession in sequence. In this way, the outer ground 13 and the inner ground 14 are cut off by the water blocking wall 10, and the inner ground 14 is excavated for construction of an underground structure or the like.

In the present embodiment, the drain 15 as a water collecting or condensing means is wrapped around the water blocking wall 10 and the ground 13 so as not to excessively project from the water blocking wall 10 toward the outer ground 13 side. And arranged. Therefore, the water blocking wall 10
The water-impervious steel plate 17 was installed between two adjacent H-shaped steels 11 so as to be in close contact with the inner flange 16 surface of the H-shaped steel, and the water-impervious steel plate 17 was used as the drain side wall on the opposite side to the ground.
The water-impervious steel plate 17 is inserted up to about 2 to 3 m below the floor mount 18.

In this way, the drain 15 has the outer ground 13
The water collecting surface or the condensing surface is faced to the inner surface, and the water shielding steel plate 17 blocks the ground water from the inner side. As shown in the drawing, the drain 15 can be disposed almost within the wall thickness of the water blocking wall 10 and installed up to the depth of the water-passing target layer 19 in the ground. As a result, the drain 15 to the outside ground 13
The projecting area can be reduced and the site efficiency is extremely good.

The drain 15 has a water-proof steel plate 17,
The connection part 20 of the water passage is provided to maintain the passage of groundwater during or after the construction between the outer ground and the inner ground, or between the outer ground and the ground on the opposite side of the construction section. You can do it. 2m at the bottom of the drain
Front and rear mud retaining portions 27 are provided.

Next, referring to FIG. 2 and FIG. 1 (a),
A drawing means for drawing the water-impervious steel plate 17 to the contact portion with the H-shaped steel 11 will be described. As shown in these drawings, an engaging means 22 for the wire 21 is provided at a predetermined position of the flange 16 of the H-shaped steel 11, and one end of the wire 21 wound around the engaging means 22 is provided with a tip end portion 23 of the water-impervious steel plate 17. To the engaging means 2
By pulling the other end of the wire 21 through 2,
Engaging means 2 while the tip 23 of the water-impervious steel plate is being pulled down
I was able to attract to 2.

At the tip of the water-impervious steel plate 17, a direction plate 2 is attached.
4 is provided so that the tip portion is deflected toward the predetermined flange side when the hole is inserted into the excavation hole. Also, H-shaped steel 11
There is a connecting portion 25 such as a bolt joint on the
If it is difficult to adhere the water-proof sheet 7 to the water and the water impermeability is impaired, the guide plate 26 may be attached to the flange 16 so that the guide plate 26 and the water-impervious steel plate 17 are brought into close contact with each other.

FIG. 4 is a perspective view showing a water passage for securing the flow of groundwater between the rocks on both sides which are blocked by the structure excavation. An underground structure 30 is constructed between two rows of water blocking walls 10 made of continuous soil cement columns.
The left side in the figure is the upstream side of the groundwater vein 31, and the right side is the downstream side. As described above, the upstream water collecting drain 15a and the downstream condensing drain 15b are arranged on each water blocking wall 10 on the outer side of the water blocking steel sheet between the H-shaped steels.
A groundwater passage 32 is provided between the water collection drain 15a and the condensate drain 15b. This protects the environment without blocking the groundwater veins. The groundwater passage 32 may be provided in the underground structure 30 or may be provided avoiding the underground structure 30.

FIG. 5 is a sectional view showing an example of a method of connecting the drain and the water passage. As shown in the figure, the connecting portion between the groundwater passage 32 and the drain 15 has a water-impervious steel plate 1
It is provided via 7. The connecting portion of the water-impervious steel plate 17 is thinly formed in advance. Hereinafter, an example of a method of connecting the drain and the groundwater passage will be described in detail.

A connecting pipe 33 with a flange is welded to a preliminarily thin portion of the water-impervious steel plate 17. Next, the sluice valve 35 is flange-connected to the connecting pipe 33. Then, a working water stop pipe 37 having an O-ring 36 is flange-connected to the sluice valve 35.

A horizontal drilling machine 38 having an outer diameter capable of effectively stopping water by effectively operating the O-ring 36 is formed so as to sequentially pass through the working water-stop pipe 37, the sluice valve 35, and the connecting pipe 33 up to the water-blocking steel plate 17. Then, the water-impervious steel plate is cut and the drain 15 is drilled. The groundwater entering from the drain 15 by drilling is stopped by the O-ring 36. Move the horizontal drilling machine 38 back to the working water shutoff pipe 37,
The sluice valve 35 is closed while the water is stopped by the O-ring 36.

After closing the sluice valve 35 to stop water, the working water shutoff pipe 37 is removed from the sluice valve 35. Next, the screen 39 for preventing the inflow of gravel or the like in the drain is interposed on the flange of the sluice valve 35 after the working water pipe 37 is removed, and the groundwater passage 32 is formed.
Attach. The groundwater passage 32 may be a pipe or a deformable hose.

With the above work, the upstream drainage drain 1
5a and the downstream condensate drain 15b are connected by the groundwater passage 32, and the upstream and downstream sluice valves are opened to allow water to flow.

[0019]

As described above, according to the present invention, in a soil cement column-type underground continuous wall, a water blocking plate is installed on the inner side between adjacent stress bearing members, and the water blocking plate is contacted to stop water. Since the drain is placed inside the wall, it is possible to minimize the protrusion of the drain on the ground outside the water blocking wall, thus improving site efficiency. Moreover, by communicating the blocked underground water vein, the regional underground environment can be preserved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, and FIG.
Is a plan view and FIG. 6B is a cross-sectional view in the vertical direction.

FIG. 2 is a perspective view showing a drawing means for drawing the water-impervious plate to a close contact portion with the stress-bearing member according to the present invention.

FIG. 3 is a perspective view for explaining another embodiment of the present invention.

FIG. 4 is a perspective view showing a water passage for ensuring the circulation of groundwater according to the present invention.

FIG. 5 is a cross-sectional view showing an example of a method of connecting a drain and a water passage according to the present invention.

[Explanation of symbols]

10 Column type underground continuous wall (water stop wall) 11 Stress bearing material (H type steel) 12 soil cement pillars 13 Outside ground 14 Internal ground 15 drain 15a Water collection drain 15b Condensate well 16 flange 17 Impermeable steel plate 18 flooring 19 Water flow target layer 20 Waterway connection 21 wires 22 Engaging means 23 Water-impermeable steel plate tip 24 direction board 25 H type steel connection 26 Guide plate 27 Mud retaining section 30 underground structure 31 Groundwater vein 32 groundwater channels 33 Connection pipe 35 Thru valve 36 O-ring 37 Water stop pipe for work 38 Horizontal drilling machine 39 screen

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[Procedure amendment]

[Submission date] July 12, 1999 (1999.7.1
2)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

2. A soil-sealing column, in which a stress-bearing material such as H-shaped steel is installed, is continuously arranged in a vertical drilling hole to form a water-stop wall, and the water-stop wall and the outer ground are wrapped. and collecting water or condensate drain, such as crushed stone drain was placed, before
Adjacent H-type at the location of the collection or condensate drain
In a water-passing method for a column-column underground continuous wall in which a water shield plate is installed on the inner side between steels, the tip of the water shield plate is used for the excavation.
While pulling down, pull it to the specified position of the H-shaped steel in the hole.
So that one end is connected to the tip of the water shield.
Wind the wire around the wire engagement means provided at the predetermined position.
Then, pull up the other end to move the water shield plate
A method of running water through a column-type underground continuous wall characterized by being installed at a specific location .

3. A soil-sealing column, in which a stress-bearing material such as H-shaped steel is installed, is continuously arranged in a vertical drilling hole to form a water-stop wall, and the water-stop wall and the outer ground are wrapped. and collecting water or condensate drain, such as crushed stone drain was placed, before
Adjacent H-type at the location of the collection or condensate drain
Install an impervious plate on the inner side between the steels, and
From the water collection drain to the condensate drain
In water flow method in provided with tubular elements formula underground continuous wall, before
The water-impermeable sheet is made thin in advance at the connection with the groundwater passage.
And cut the previously thinly formed connecting part to
A water channel is installed, and gravel, etc. flows into the groundwater channel.
A water-flowing method for pillar-type underground continuous walls, which is equipped with a screen that prevents

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

The water-flowing method for a column-lined underground continuous wall of the present invention has solved the above-mentioned problems as follows. In the present invention, a soil cement column having a stress bearing material such as H-shaped steel is continuously arranged in a vertical drilling hole to form a water blocking wall, and is wrapped around the water blocking wall and the outer ground. collecting water or condensate drain, such as crushed stone drain was placed Te, before
Adjacent H-type at the location of the collection or condensate drain
In the water-passing method in the column-column type underground continuous wall in which the water blocking plate is installed on the inner side between the steel, the tip of the water blocking plate is
The H-shaped steel in the drill hole is inserted while being deflected to the predetermined position.
So that the tip of the water shield plate has a deflection angle
It is characterized by having a plate . Also, the tip of the water blocking plate
Part is pulled down into place in the H-section steel in the hole.
So that it can be attracted while
A wire attachment provided at the predetermined position with the wire connecting the ends.
By winding it around the coupling means and pulling up the other end,
It is characterized in that the water shield plate is installed at a predetermined position . Also,
The above-mentioned impervious sheet is made thin in advance at the connection with the groundwater passage.
Then, the previously formed thin connection is cut to remove the groundwater.
Set up a water passage to prevent the inflow of gravel, etc. into the groundwater passage.
It is characterized by having a screen for prevention . According to the present invention, the water shield plate is specified in the soil cement in the drill hole.
It can be installed in the position of with high accuracy and certainty by a simple operation. Well
Also, it is easy to connect the groundwater channel to the specified position of the water shield.
Therefore, it is possible to prevent gravel and the like from flowing into the water passage. Furthermore
In addition, the water collecting surface or the water collecting surface of the water collecting or condensing means such as a drain can be made to face the outer ground, and groundwater can be blocked from the inside by a water blocking plate. And since such water collecting or condensing means can be installed within the wall thickness of the water blocking wall,
The number of protrusions to the outer ground is reduced, and the site efficiency is extremely good.

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 390036467             Naruyuki Industry Co., Ltd.             1-13-13 Awaza, Nishi-ku, Osaka City, Osaka Prefecture (72) Inventor Keiichi Sakamoto             31 Ichibancho, Chiyoda-ku, Tokyo             Within Takagumi (72) Inventor Yoshinori Matsuda             1-10-21 Nakameguro, Meguro-ku, Tokyo Yachi             Dai Engineering Co., Ltd. (72) Inventor Yuji Koshino             19 Nichia Steel Industry Stock Association, Nakahama-cho, Amagasaki City, Hyogo Prefecture             In-house (72) Inventor Kunifuji ▲ Toshi ▼ Hikaru             13-13 Awaza, Nishi-ku, Osaka City, Osaka Prefecture             Naruyuki Kogyo Co., Ltd. (72) Inventor Yoshihiro Nakazawa             19 Nichia Steel Industry Stock Association, Nakahama-cho, Amagasaki City, Hyogo Prefecture             In-house (72) Inventor Kiyoshi Hayashi             3-1-2, Iwamotocho, Chiyoda-ku, Tokyo             Koyuki Industry Co., Ltd. F-term (reference) 2D049 BA16 BA17 BA19 CA03 CD07                       DA04 DB05

Claims (6)

[Claims] 1. A water-stop wall is formed by continuously arranging a soil cement column having a stress-bearing material such as H-shaped steel in a vertical drilling hole in the ground to form a water-stop wall, and wrapping the water-stop wall and the outside ground with a ground. In the water passage method in the column-type underground continuous wall where the water collecting or condensing means such as crushed stone drain is arranged, the arrangement part of the water collecting or condensing means is the inner side between the stress-bearing members adjacent to each other. A water-passing construction method for a column-lined underground continuous wall, wherein a water-blocking plate is installed on the water-blocking plate, and the water-collecting or condensing means is arranged on the outside in contact with the water-blocking plate. 2. The water-impervious plate is placed in close contact with the stress-bearing member between the stress-bearing members installed in the drill holes at both ends of the three consecutive drill holes. Water flow method. 3. The water-passing method according to claim 1, wherein the impermeable plate is installed in close contact with the flange of the stress-bearing member. 4. The water-passing method according to claim 1, wherein the impermeable plate is installed in close contact with a guide plate provided on the stress-bearing member. 5. The water passage method according to claim 1, wherein a direction plate whose insertion direction is regulated is provided at the tip of the water shield plate. 6. The pulling means for pulling the water shield plate to the close contact portion with the stress bearing material is provided with wire engaging means at a predetermined depth portion of the stress bearing material, and is wound around the engaging means. By connecting one end of the turned wire to the tip of the water shield plate and pulling up the other end of the wire through the engaging means,
The water-passing method according to any one of claims 1 to 5, wherein the water shield plate is pulled down to the engaging means while being pulled down.